edison



(NoModeD WITNESSES T. A. EDISON. ELECTRIC ARC LI GHT.,

Patented Apr. 29, 1884.

INVENTOR iaa ATTORNEYS.

n In oLhhagnpher, Washington.

- electro-magnet. tro-magnet in the line I form a shunt contain- THOMAS A. EDISON, OF MENLO PARK, NEYV JERSEY, ASSIGNOR TO THE EDISON ELECTRIC LIGHT COMPANY, OF NEV YORK, N. Y.

ELECTRIC-ARC LIGHT.

EJPE LFICATEON forming part of Letters Patent No. 297,580, dated April 29, 188%.

Application filed November 28, 1881. (No model.)

To all whom it may concern:

Be it known that I, THOMAS A. EDIsoN, of Mcnlo Park, in the county of MiddleseX and State of New J crsey, have invented anew and useful Improvement in Electric-Arc Lights, (Case No. 368;) and I do hereby declare that the following is a full and exact description of the same, reference being had to the accompanying drawings, and to the letters of refer enee marked thereon.

The object I have in view is to produce means for governing the regulating mechanism of voltaic-arc lamps which will be simple in construction and efficient in action by the employnient of opposing solenoids or electromagncts having coils of the same resistance.

In carrying out my invention I arrange the coils of one solenoid or electro-inagnet in the line or are circuit, and the coils of the other solenoid or electro-maguet in a shunt-circuit around the carbons and the first solenoid or Around the solenoid or elecing a resistance,which is proportioned to make a proper division of e the current and to in crease to the required degree the current-carrying capacity of the line over that of the shunt around the are. This resistance is preferably made adjustable. The coils of the two solenoids or eleetro-magnets are wound in opposite directions,and may act upon the same or different movable cores or armature's. It will be understood that the magnet or solenoid in the line, while of the same resistance as that in the shunt around the are, has a greater number of coils in its winding, so as to give it a predominating force when the carbons are in contact. This is accomplished by making the wire of the magnet or solenoid in the line of greater conductivity per unit of length than that of the magnet or solenoid in the shunt, the length being increased to equalize the resistance. lVhere they act upon the same movable or stationary core, one set of such coils can be wound upon the other.

I'Ieretofore, in regulating arc-lamps by the differential action of opposing solenoids or electro-magnets, one of such solenoids or electro-magnets has been made of low resistance and placed in the line, while the other solenoid or electro magnet located in the shunt around the are has been made of much higher resistance; but by the use of the shunt-circuit around the solenoid or elcctro-magnet in the line, and by providing the magnet with a greater number of coils in its winding, I am enabled to make both of such solenoids or electro-magnets of the same resistance.

The foregoing will be better understood from the drawing, in which the figure is a diagrammatic viewof my arrangement.

1 2 represent the line in which are placed the carbons O C and the coils of the solenoid or electro-magnet M.

3 4 represent a shunt-circuit around the carbons and the solenoid or electro-magnet M.

In 3 4 are placed the coils of the solenoid or electro-magnet M. Both M and M are shown as surrounding the same stationary core 13 and acting on the same armature A which is arranged to control the regulating mechanism. M and M, being woundin opposite directions, act oppositely upon the core B and armature A.

Around the clectro-magnet or solenoid M is a shunt-circuit, 5 6, which is connected with the line on opposite sides of M, and is provided with a proper resistance, R, which is prcferably adjustable. Then the lamp is first put in circuit, the carbon-points are together; but the passing of the current throughthe magnet M energizes said magnet,which, actingon the armature A, draws the upper carbon, 0, away from the lower one, 0, a sufiicient distance to cause the formatiomof the voltaic arc. IVhen the carbons become consumed, however, and the resistance of the main circuit which con tains the are becomes greater, a greater portion of the current flows through the shunt 3 4, energizing the magnet M, which, acting in opposition to the magnet M, causes the armature Ato drop and let the carbon C fall the proper distance. It is evident that in practice this operation after the arc is once formed would be a continuous one.

WVhat I claim is 1. In regulating mechanism for arc-lamps, the combination of the opposing solenoids or electro-magnets located one in theline and the other in a shunt around the are, both of such This specification signed and witnessed this IO solenoids or elcetro-magnets having the same 7th day of November, 1881. resistance, substantially as set forth.

7 2 In regulating mechanism for arc-lamps, TIIOS. A. EDISON. 5 the solenoid or electro-magnets of the same resistance located in the line and in a shunt 'Witnesses: around the are, in combination with a shunt RIOIIDZ N. DYER, around the solenoid or elcctro-inag'net in the H. \V. SEELY. line, substantially as set forth. 

